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Cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material and its preparation method and application

A technology of bismuth oxyiodide and composite materials, applied in chemical instruments and methods, water pollutants, chemical/physical processes, etc., can solve the problem of not much neutral red, achieve good light drop efficiency, and solve the effect of difficult recovery

Active Publication Date: 2021-04-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are not many studies on neutral red in the field of photocatalytic degradation.

Method used

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  • Cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material and its preparation method and application
  • Cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material and its preparation method and application
  • Cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Synthesis of Example 1 BiOI

[0030] 1. Take 0.006mol (2.91g) Bi(NO 3 ) 3 ·5H 2 O was dissolved in 160 mL of ethylene glycol, and stirred thoroughly at room temperature to obtain a white turbid liquid as A.

[0031] 2. Dissolve 0.006mol (0.996) KI in 160mL deionized water to form solution B. Add solution B to solution A dropwise using a constant pressure funnel, and keep stirring for 20min-40min.

[0032] 3. Then transfer it to a 500mL autoclave, and treat it at a constant temperature of 160°C for 18-24h.

[0033] 4. Suction filtration under reduced pressure and wash with deionized water and absolute ethanol three times respectively.

[0034] 5. Finally, dry at 65°C to obtain BiOI nanoparticles.

[0035] The cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material was experimentally prepared, in which the loading of bismuth oxyiodide was 10%-70%. The following examples respectively introduce materials with bismuth oxyiodide loading of 10%, 30% an...

Embodiment 2

[0036] Example 2 Synthesis of 10%BiOI / CoCr-LDHs

[0037] 1. Take 0.001mol (0.352g) of BiOI and pour it into a 500mL three-necked flask, and add 50mL of deionized water.

[0038] 2. Take Co(NO with a molar ratio of 3:1 3 ) 2 ·6H 2 O 0.03mol (8.73g) and Cr (NO 3 ) 2 9H 2 O 0.01mol (4.00g), dissolved in 100mL of deionized water to form solution A.

[0039] 3. Take 0.16mol (3.2g) NaOH and 0.01mol (0.05g) NaOH 2 CO 3 Dissolve in 100mL deionized water to make solution B.

[0040] 4. Double drop solutions A and B into a three-necked flask, keep stirring, and control the pH between 9-10.

[0041] 5. Continue to stir for 1 hour after dropping, and then crystallize at 65°C for 24 hours.

[0042] 6. Suction filtration and washing, drying in an oven at 65°C for 18 hours, and grinding to obtain the cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material, which is recorded as 10% BiOI / CoCr-LDHs.

Embodiment 3

[0043] The synthesis of embodiment 3 30%BiOI / CoCr-LDHs

[0044] 1. Take 0.003mol (1.056g) of BiOI and pour it into a 500mL three-necked flask, and add 50mL of deionized water.

[0045] 2. Take Co(NO with a molar ratio of 3:1 3 ) 2 ·6H 2 O 0.03mol (8.73g) and Cr (NO 3 ) 2 9H 2 O 0.01mol (4.00g), dissolved in 100mL of deionized water to form solution A.

[0046] 3. Take 0.16mol (3.2g) NaOH and 0.01mol (0.05g) NaOH2 CO 3 Dissolve in 100mL deionized water to make solution B.

[0047] 4. Double drop solutions A and B into a three-necked flask, keep stirring, and control the pH between 9-10.

[0048] 5. Continue to stir for 1 hour after dropping, and then crystallize at 65°C for 24 hours.

[0049] 6. Suction filtration and washing, drying in an oven at 65°C for 18 hours, and grinding to obtain the cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material, which is recorded as 30% BiOI / CoCr-LDHs.

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Abstract

The invention discloses a cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material. The composite material is prepared according to the following method: 0.4‑0.8mol / L Co(NO 3 ) 2 ·6H 2 O aqueous solution and 0.1‑0.4mol / L Cr(NO 3 ) 2 9H 2 O aqueous solution is mixed to form solution A, and 1.4-1.6mol / L NaOH solution and 0.08-0.1mol / L NaOH solution are mixed 2 CO 3 The solutions are mixed to form solution B; slowly add the solution A and solution B to bismuth oxyiodide at the same time and stir evenly, under nitrogen atmosphere, stir at room temperature for 10-12h to obtain a reaction mixture, and obtain the target after post-processing product. The cobalt-chromium hydrotalcite-supported bismuth oxyiodide composite material of the invention can be used as a catalyst for photodegradation of neutral red, the degradation rate can reach 96.1%, and the catalyst can be recycled, which solves the disadvantage that traditional catalysts are difficult to recycle.

Description

[0001] (1) Technical field [0002] The invention relates to a novel hydrotalcite composite material formed by loading bismuth oxyiodide on cobalt-chromium hydrotalcite, a preparation method and application thereof. [0003] (2) Background technology [0004] Neutral red is a typical cationic azo dye, which is widely used in dyeing and printing of leather, paper, clothing, etc., as well as paint and rubber coloring, and a large amount of polluted wastewater is discharged during the production process. Due to the relatively stable structure of neutral red, conventional adsorption methods, extraction methods, biodegradation methods and other treatment methods are difficult to achieve the desired removal effect, and may cause secondary pollution problems. Photocatalytic oxidation technology has the advantages of low cost, high efficiency, and no secondary pollution, and is widely used in the degradation of organic pollutants. However, there are not many studies on neutral red in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/132C02F1/30C02F101/36C02F101/38
CPCC02F1/30B01J27/132C02F2305/10C02F2101/36C02F2101/38C02F2101/308B01J35/39
Inventor 夏盛杰张晓锋薛继龙倪哲明
Owner ZHEJIANG UNIV OF TECH
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